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DS1921H Schematic ( PDF Datasheet ) - Dallas Semiconducotr

Teilenummer DS1921H
Beschreibung High-Resolution Thermochron iButton
Hersteller Dallas Semiconducotr
Logo Dallas Semiconducotr Logo 




Gesamt 30 Seiten
DS1921H Datasheet, Funktion
www.DataSheet4U.com
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DS1921H/Z
High-Resolution Thermochron iButton
Range H: +15°C to +46°C; Z: -5°C to +26°C
SPECIAL FEATURES
Digital thermometer measures temperature in
1/8°C increments with ±1°C accuracy
Built-in real-time clock (RTC) and timer has
accuracy of ±2 minutes per month from 0°C
to 45°C
Automatically wakes up and measures
temperature at user-programmable intervals
from 1 to 255 minutes
Logs up to 2048 consecutive temperature
measurements in protected nonvolatile (NV)
random access memory
Records a long-term temperature histogram
with 1/2°C resolution
Programmable temperature-high and
temperature-low alarm trip points
Records up to 24 time stamps and durations
when temperature leaves the range specified
by the trip points
512 bytes of general-purpose read/write NV
random access memory
Communicates to host with a single digital
signal at 15.4kbits or 125kbits per second
using 1-Wire® protocol
Fixed range: H: +15°C to +46°C;
Z: -5°C to +26°C
Durable stainless steel case engraved with
registration number withstands harsh
environments
Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
Presence detector acknowledges when reader
first applies voltage
Meets UL#913 (4th Edit.). Intrinsically Safe
Apparatus: approved under Entity Concept
for use in Class I, Division 1, Group A, B, C,
and D Locations (application pending)
F5 MICROCAN
5.89
0.51
16.25
D6 21
3B2000FBC52B
1-Wire
Thermochron®
17.35
IO GND
COMMON iButton FEATURES
All dimensions are shown in millimeters.
Digital identification and information by
momentary contact
ORDERING INFORMATION
Unique, factory-lasered and tested 64-bit reg-
istration number (8-bit family code + 48-bit
serial number + 8-bit CRC tester) assures ab-
DS1921H-F5 +15°C to +46°C F5 iButton®
DS1921Z-F5 -5°C to +26°C F5 iButton
solute traceability because no two parts are
alike
Multidrop controller for 1-Wire net
Chip-based data carrier compactly stores
information
Data can be accessed while affixed to object
Button shape is self-aligning with cup-shaped
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
probes
1-Wire, Microcan, and iButton are registered trademarks of Dallas Semiconductor.
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DS1921H Datasheet, Funktion
DS1921H/Z REGISTER PAGE MAP Figure 6
ADDR
0200h
0201h
0202h
b7
0
0
0
0203h
0204h
0205h
0206h
0207h
0208h
0209h
0
0
CENT
MS
MM
MH
020Ah
020Bh
020Ch
020Dh
MD
b6 b5 b4 b3 b2 b1 b0
10 Seconds
Single Seconds
10 Minutes
Single Minutes
12/24 20h. 10h.
AM/PM
Single Hours
0000
Day of Week
0 10 Date
Single Date
0 0 10m.
Single Months
10 Years
Single Years
10 Seconds Alarm
Single Seconds Alarm
10 Minutes Alarm
Single Minutes Alarm
12/24 10ha.
A/P
10h.
alm.
Single Hours Alarm
0000
Day of Week Alarm
Temperature Low Alarm Threshold
Temperature High Alarm Threshold
Number of Minutes Between Temperature Conversions
020Eh
020Fh
0210h
0211h
0212h
0213h
0214h
0215h
0216h
0217h
0218h
0219h
021Ah
021Bh
021Ch
021Dh
021Eh
021Fh
EOSC
TCB
EMCLR
0
EM RO TLS THS
(no function, reads 00h)
(no function, reads 00h)
Temperature Read Out (Forced Conversion)
Low Byte
High Byte
MEMCLR MIP
SIP
0
TLF THF
Minutes
Hours
Date
Month
Year
Low Byte
Center Byte
High Byte
Low Byte
Center Byte
High Byte
TAS
TAF
DS1921H/Z
Function Access*
Real-
Time
Clock
Registers
R/W; R/W**
Real-
Time
Clock
Alarm
Registers
Temp.
Alarms
Sample
Rate
Control
(N/A)
(N/A)
Temp.
Start
Delay
Status
R/W; R/W**
R/W; R/W**
R/W; R**
R/W; R/W**
R; R**
R; R**
R; R**
R/W; R/W**
R/W; R/W
Mission
Time
Stamp
R; R
Mission
Samples
Counter
Device
Samples
Counter
R; R
R; R
*The first entry in column ACCESS is valid between missions. The second entry shows the applicable
access mode while a mission is in progress.
**While a mission is in progress, these addresses can be read. The first attempt to write to these registers
(even read-only ones), however, will end the mission and overwrite selected writeable registers.
TIMEKEEPING
The RTC/alarm and calendar information is accessed by reading/writing the appropriate bytes in the
register page, address 200h to 206h. Note that some bits are set to 0. These bits will always read 0
regardless of how they are written. The contents of the time, calendar, and alarm registers are in the
Binary-Coded Decimal (BCD) format.
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DS1921H pdf, datenblatt
Mission Samples Counter Register Map
ADDR b7 b6 b5 b4 b3 b2 b1 b0
021Ah
Low Byte
021Bh
Center Byte
021Ch
High Byte
DS1921H/Z
DEVICE SAMPLES COUNTER
The Device Samples Counter indicates how many temperature measurements have taken place since the
device was assembled at the factory. The value is stored as an unsigned 24-bit integer number. The
maximum number that can be represented in this format is 16777215, which is higher than the expected
lifetime of the DS1921H/Z iButton. This counter cannot be reset under software control.
Device Samples Counter Register Map
ADDR b7 b6 b5 b4 b3 b2 b1 b0
021Dh
Low Byte
021Eh
Center Byte
021Fh
High Byte
TEMPERATURE LOGGING AND HISTOGRAM
Once setup for a mission, the DS1921H/Z logs the temperature measurements simultaneously byte after
byte in the datalog memory as well as in histogram form in the histogram memory. The datalog memory
is able to store 2048 temperature values measured at equidistant time points. The first temperature value
of a mission is written to address location 1000h of the datalog memory, the second value to address
location 1001h and so on. Knowing the starting time point (Mission Time Stamp), the interval between
temperature measurements, the Mission Samples Counter, and the rollover setting, one can reconstruct
the time and date of each measurement stored in the datalog.
There are two alternatives to the way the DS1921H/Z will behave after the 2048 bytes of datalog memory
is filled with data. With rollover disabled (RO = 0), the device will fill the datalog memory with the first
2048 mission samples. Additional mission samples are not logged in the datalog, but the histogram, and
temperature alarm memory continue to update. With rollover enabled (RO = 1), the datalog will wrap
around, and overwrite previous data starting at 1000h for the every 2049th mission sample. In this mode
the device stores the last 2048 mission samples.
For the temperature histogram, the DS1921H/Z provides 64 bins that begin at memory address 0800h.
Each bin consists of a 16-bit, non-rolling-over binary counter that is incremented each time a temperature
value acquired during a mission falls into the range of the bin. The least significant byte of each bin is
stored at the lower address. Bin 0 begins at memory address 0800h, bin 1 at 0802h, and so on up to
087Eh for bin 63, as shown in Figure 7. The number of the bin to be updated after a temperature
conversion is determined by cutting off the two least significant bits of the binary temperature value. Out
of range values are range locked and counted as 00h or FFh.
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